Fix octoprint errors when trying to share uploads (#140)

Co-authored-by: Enrique Munoz <enrique.munoz@oracle.com>

util.sh

@@ -172,9 +172,9 @@ share_uploads() {
         fi
         echo
         #Remove Quit and Custom from array, is there a cleaner way?
-        unset 'options[-1]'
-        unset 'options[-1]'
-        for instance in "${options[@]}"; do
+        unset 'INSTANCE_ARR[-1]'
+        unset 'INSTANCE_ARR[-1]'
+        for instance in "${INSTANCE_ARR[@]}"; do
             $OCTOEXEC --basedir /home/$user/.$instance config set folder.uploads "$opt"
         done
         break